[gradsusr] help in opening file

[Jennifer Adams]

You need a complete descriptor file (dtype netcdf) with a PDEF entry. Please have a look at the doc page in your error message as well as 
http://iges.org/grads/gadoc/descriptorfile.html and http://iges.org/grads/gadoc/pdef.html . 
--Jennifer


On May 14, 2012, at 4:03 AM, Ashok Priyadarshan Dimri wrote:

> Hi,
> Could anyone guide me through to use tke.mon.mean.nc file.
> sdfopen tke.mon.mean.nc
> give
> Scanning self-describing file:  tke.mon.mean.nc
> gadsdf: SDF file has no discernable X coordinate.
> To open this file with GrADS, use a descriptor file with an XDEF entry.
> Documentation is at http://iges.org/grads/gadoc/SDFdescriptorfile.html
> 
> 
> While looking into it (ncdump tke.mon.mean.nc)
> it is 
> netcdf tke.mon.mean {
> dimensions:
>     y = 277 ;
>     x = 349 ;
>     level = 15 ;
>     time = UNLIMITED ; // (384 currently)
>     nbnds = 2 ;
> variables:
>     int Lambert_Conformal ;
>         Lambert_Conformal:grid_mapping_name = "lambert_conformal_conic" ;
>         Lambert_Conformal:standard_parallel = 50., 50. ;
>         Lambert_Conformal:longitude_of_central_meridian = -107. ;
>         Lambert_Conformal:latitude_of_projection_origin = 50. ;
>         Lambert_Conformal:false_easting = 5632642.22547 ;
>         Lambert_Conformal:false_northing = 4612545.65137 ;
>     float lat(y, x) ;
>         lat:long_name = "latitude coordinate" ;
>         lat:units = "degrees_north" ;
>         lat:standard_name = "latitude" ;
>         lat:axis = "Y" ;
>         lat:coordinate_defines = "point" ;
>     float level(level) ;
>         level:units = "millibar" ;
>         level:actual_range = 1000.f, 600.f ;
>         level:long_name = "Level" ;
>         level:positive = "down" ;
>         level:GRIB_id = 100s ;
>         level:GRIB_name = "hPa" ;
>         level:axis = "Z" ;
>         level:coordinate_defines = "point" ;
>     float lon(y, x) ;
>         lon:units = "degrees_east" ;
>         lon:long_name = "longitude coordinate" ;
>         lon:standard_name = "longitude" ;
>         lon:axis = "X" ;
>         lon:coordinate_defines = "point" ;
>     double time(time) ;
>         time:units = "hours since 1800-1-1 00:00:0.0" ;
>         time:long_name = "Time" ;
>         time:actual_range = 1569072., 1848840. ;
>         time:delta_t = "0000-01-00 00:00:00" ;
>         time:avg_period = "0000-01-00 00:00:00" ;
>         time:prev_avg_period = "0000-00-01 00:00:00" ;
>         time:standard_name = "time" ;
>         time:axis = "T" ;
>         time:coordinate_defines = "start" ;
>     double time_bnds(time, nbnds) ;
>         time_bnds:long_name = "Time Boundaries" ;
>     short tke(time, level, y, x) ;
>         tke:long_name = "Monthly Turbulent Kinetic Energy on Pressure Levels" ;
>         tke:valid_range = -32765s, -22766s ;
>         tke:unpacked_valid_range = 0.f, 105.f ;
>         tke:actual_range = 0.f, 16.48f ;
>         tke:units = "J/kg" ;
>         tke:add_offset = 327.66f ;
>         tke:scale_factor = 0.01f ;
>         tke:missing_value = 32766s ;
>         tke:_FillValue = -32767s ;
>         tke:precision = 2s ;
>         tke:least_significant_digit = 2s ;
>         tke:GRIB_id = 158s ;
>         tke:GRIB_name = "TKE" ;
>         tke:var_desc = "Turbulent Kinetic Energy" ;
>         tke:dataset = "NARR Monthly Averages" ;
>         tke:level_desc = "Pressure Levels" ;
>         tke:statistic = "Mean" ;
>         tke:parent_stat = "Individual Obs" ;
>         tke:cell_methods = "time: mean (monthly from 3-hourly values)" ;
>         tke:grid_mapping = "Lambert_Conformal" ;
>         tke:coordinates = "lat lon" ;
>     float x(x) ;
>         x:long_name = "eastward distance from southwest corner of domain in projection coordinates" ;
>         x:units = "m" ;
>         x:standard_name = "projection_x_coordinate" ;
>     float y(y) ;
>         y:long_name = "northward distance from southwest corner of domain in projection coordinates" ;
>         y:units = "m" ;
>         y:standard_name = "projection_y_coordinate" ;
> 
> // global attributes:
>         :Conventions = "CF-1.0" ;
>         :title = "Monthly NARR" ;
>         :history = "created 2005/07 by Hoop (netCDF2.3)" ;
>         :comments = "Data is from North American Regional Reanalysis\n",
>             "(8x/day).  It consists of most variables interpolated to\n",
>             "pressure surfaces from model (sigma) surfaces." ;
>         :institution = "National Centers for Environmental Prediction" ;
>         :platform = "Model" ;
>         :references = "http://wwwt.emc.ncep.noaa.gov/mmb/rreanl/index.html\n",
>             "http://www.esrl.noaa.gov/psd/data/gridded/data.narr.html" ;
>         :NCO = "4.0.0" ;
> 
> Sorry for long massage
> Dimri
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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